There is no
universal clarity/color grading standard for colored
gemstones. They can be graded in a similar way to diamonds with
some significant differences. Color, clarity, cut, and weight are the main value
factors. The difference is that these factors are evaluated and
weighted differently than in diamonds. In colored stones, color is the main
consideration (most dealers assess the color component of a stone at between 50%
to 70% of its value) .

Unlike with diamonds, a minor clarity difference
rarely affects the price of colored stones, and in some cases a stone can be
valued more with a lesser clarity grade. A sapphire for example with a rich
"velvety" type color is preferred over one that has a diamond like transparency
even if that means the stone might contain minor rutile
internally.

Below you can find the GIA clarity charts for
colored stones. One thing you might notice, there is no flawless
rating for colored stones, the argument is that by
looking with high powered magnification, you can always find a spot,
crystal growth, included crystal, or something if you look hard enough,
since they are natural stones.

Type 1 Gemstones are gemstones that are
normally found to be clean. This includes gems such as
Amethyst, Aquamarine, Blue Topaz, Citrine, Kunzite, Tanzanite,
Yellow Beryl, Yellow Chrysoberyl and
Diamond.